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If Christie Brinkley wanted to utterly humiliate her two-timing husband, she sure as hell got her wish yesterday.

In a gasp-inducing first day of their divorce trial, the supermodel’s lawyers exposed her wayward husband, Peter Cook, as a sex-crazed, porn-obsessed pervert who hired an 18-year-old girl at his architectural firm just to get her into bed.

The normally staid Suffolk County courthouse in Central Islip turned into an adults-only peep show when the 49-year-old cad admitted under oath that he habitually ogles online pornography, masturbates in front of strangers via a Web cam, and even had sex inside his office with the comely clerk.

His barely legal mistress-turned-star-witness Diana Bianchi then nervously took the witness stand yesterday and detailed how she gave herself up to him after several advances within weeks of being hired.

She also said Cook leaned on her to help him cover up the affair.

Among the dirty details also laid bare yesterday:

* Cook began flirting with Bianchi when she was only a high-school student and cashier at a toy store. He admitted he hired her with sex on his mind.

* Cook spent $3,000 a month on Web porn, pleasured himself on a Web cam, and trolled for sex partners on swinger sites using handles such as wannaseeall and happyladdie2002.

* He paid his teenage mistress $20,000 in “salary” in addition to gifts of lingerie, jewelry and cash.

* He tried to cover up the affair, and ultimately paid Bianchi $300,000 in hush money.

* Cook tried to bail himself out by revealing he and Brinkley viewed porn together as a “precursor” to sex.

Brinkley had insisted the custody battle with Cook over their two children be conducted in open court, despite his protesting that the embarrassing revelations would emotionally scar their kids for years.

It didn’t take long for the shame-faced Cook to burst into tears as he recounted under oath how he spent his evenings trolling porn sites while masturbating in front of strangers over a Web cam.

At first, he matter-of-factly answered questions about his hanky-panky with Bianchi. But when grilled about his online porn passion, the dapperly dressed Cook lost control.

“Is it correct, sir, that you have masturbated in front of a Web cam?” his lawyer, Mark Winkler, asked.

Red-faced, Cook replied: “Yes, I have, privately, secretly – never at home, never in front of my children.”

Wiping tears from his eyes, Cook admitted he sought “young fit girls” from swinger Web sites while confirming he was a voracious viewer of pornography.

Jack, Brinkley’s now-13-year-old son from her previous marriage to Ricky Taubman, even caught a glimpse of the smut in 2006, Cook admitted.

He confessed that his lust for Bianchi, whom he paid $20,000 for the time she worked as a clerk at his architecture firm, “was an inducement into hiring her.”

But the cheating hubby said it was Bianchi who forced the issue, saying they only kissed until one day, she just took off her clothes in his office and declared, “Let’s have sex.”

Cook coldly admitted that he slept with Bianchi about 12 times – at his office and at his homes in Sag Harbor and Water Mill – starting in March 2005.

In one e-mail to the teen, he gushed: “I don’t know, you put me under your spell. You never asked me, but I left you money anyway.”

The architect also owned up to subscribing to a site that allows viewers to instruct woman to strip off their clothes and cavort via a Web cam.

Cook wasn’t the only one to come away tarnished from yesterday’s testimony, said one of his lawyers, Norman Sheresky.

“Opening the case to the public is bad for the kids. That’s not good motherhood, that’s not acceptable,” Sheresky fumed. “[Brinkley] wants nothing but to get even. She and her lawyers and her p.r. people are pitching a new history.”

“He did it and it was wrong,” Sheresky said of the affair. “And we said so. And there is no way to make this right. Peter has apologized. He’s cried his eyes out. He’s lost his marriage.”

He then pointed out that Brinkley herself has a poor marital track record.

“For goodness sake: She’s on her fourth husband,” Sheresky told the court. “Your honor, we’re here because of the self-indulgent wrath of a woman scorned . . . That’s putting her agenda in front of the best interests of the children. What kind of a mother wants her husband flogged in public?”

Brinkley, dressed in a white shirt and a khaki skirt, appeared anxious and at times on the verge of tears, but remained composed – and, at 54, still a knockout.

“To Christie, her union with Mr. Cook was near perfect,” her lawyer, Robert Cohen, said.

“She is blessed in that she had the flexibility and good fortune to continue her career as a model spokesperson and humanitarian.”

The parade of witnesses yesterday also included Bianchi’s stepfather, Brian Platt, who blew the lid off the illicit affair and dropped a dime to Brinkley.

“There was entire world of cybersex that Mr. Cook was involved in,” Cohen said.

He claimed that Cook spent $3,000 a month on porn sites and matchmaking. He pleasured himself over a Web cam, Cohen said, and would hit on potential sexual partners with lines like, “Hey there, I’m a horny dude. Spare me the philosophy. ‘Eff’ me,” Cohen said.

Cohen even brought up Cook’s 1982 cocaine bust for selling $125 worth of powder to an undercover cop in Huntington. Cook, 23, at the time ended up serving 60 days in jail.

Cohen further accused Cook of being a poor father who insisted the kids eat separately in the kitchen, away from the parents.

He also said Cook lost interest in Jack after his biological daughter, Sailor, was born in 1998. He further became extremely critical of Alexa Ray Joel, 22, according to Cohen.

Cook lunched on turkey with rice soup and crackers at the courthouse cafeteria, while Brinkley was hustled into a private lawyer’s lounge away from the media.

“Hair and makeup,” Cook gibed to The Post about her need for privacy.

“What do I need privacy for?”

Meanwhile, a teary and clearly distraught Bianchi shuttled between a restroom and private waiting area surrounded by court officers as she waited for her turn to testify.

At one point, Bianchi shared the bathroom with Alexa. It’s unclear if the two exchanged words. They later stood side by side amid an awkward silence as they waited their turns to take the stand.

Brinkley and as many as three previous girlfriends of Cook could testify as early as today, including Carri Lyn Ciamarra, an ex-flame, and his current love, Suzanne Shaw.